Fig. 6 Broke Valve In Balanced Position

Fig. 3 Brake Valve Applied - Normal Operation

TM-5-3820-256-24-4 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
Page Navigation
113

SERVICE MANUAL Fig. 5 Brake Valve Applied - Loss of Air In Primary Circuit 1 Primary Piston 2 Primary Delivery 3 Relay Piston 4 Secondary Delivery 5 Secondary Exhaust Valve Closed 6 Secondary Inlet Valve Open 7 Secondary Supply 8 No Air in Primary Circuit Balanced - Secondary Circuit of Brake Valve (Fig. A) When the air pressure on the secondary side of the relay piston approaches that being delivered on the primary side of the relay piston, the relay piston moves closing the secondary inlet valve and stopping further flow of air pressure from the supply line through the valve. The exhaust remains closed as the secondary supply pressure balances the secondary delivery pressure. When applications in the graduating range are made, a balanced position in the primary portion is reached as the air pressure on the delivery side of the primary piston equals the effort exerted by the driver’s foot on the pedal or treadle. A balanced position in the secondary portion is reached when air pressure on the secondary side of the relay piston closely approaches the air pressure on the primary side of the relay piston . Fig. 6 Broke Valve In Balanced Position 1 Primary Piston 2 Primary Delivery 3 Primary Exhaust Valve Closed 4 Relay Piston 5 Secondary Delivery 6 Secondary Exhaust Valve Closed 7 Secondary Inlet Valve Closed 8 Secondary Supply 9 Primary Inlet Valve Closed 10 Primary Supply When the brake pedal or treadle is fully depressed, both primary and secondary inlet valves remain open and full reservoir pressure is delivered to the actuators. Releasing - Primary Circuit of Brake Valve (Fig. 7) With the brake pedal released, mechanical force is removed from the spring seat, rubber graduating spring and primary piston. Air pressure and spring load move the primary piston, opening the primary exhaust valve, allowing air pressure in the primary delivery line to exhaust out the exhaust port. Releasing - Secondary Circuit of Brake Valve (Fig. 7) With the brake pedal released, air is exhausted from the primary side of the relay piston. Air pressure and spring load move the relay piston, opening the secondary exhaust valve, allowing air pressure in the secondary delivery line to exhaust out the exhaust port. CTS-4079 - CHAPTER IV PRINTED IN UNITED STATES OF AMERICA Page 5

Privacy Statement
Press Release
Contact